Phone Directories

Switchboard
Lycos' WhoWhere
Infobel - for U.S. and foreign countries

Zip Codes & Area Codes

Area Code Decoder - U.S. and foreign
U.S. Postal Service zip code lookup

Travel

Mapquest
Yahoo maps
Google Maps

Hopstop - bus and subway directions for major cities: New York, Boston, Chicago, San Francisco, and Washington D.C.

Fodor's Travel
Time zones
Weather
Flight Stats - real-time and historical flight performance and delay information.
World Airport Guides - from World Travel Guide, gives information on airports, and ground transportation to and from their locations

World Factbook - published by the CIA, with country profiles, maps, flags etc.

Traveler's Health - prepare for a trip with information on health issues at your destination provided by the U.S. Center for Disease Control

Calendar

Infoplease Perpetual Calendar
Perpetual calendar with leap year information
Timeanddate.com - tools for time conversion, world time zones, perpetual calendars etc.
Fact Monster's Holidays
Days calculator - calculate the number of business days between two dates

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Currency

Universal currency converter
Oanda FXTrade Currency converter (printable cheat sheet) - Select currency, date for the exchange rate, and type of rate. Then print the generated chart.
Historical Exchange rates - from the U.S. Federal Reserve, beginning Jan. 4, 1971 in most cases, foreign currency to U.S. dollars rates

Directories

Martindale Hubbell - lawyer locator, legal directory
Findlaw lawyer directory
American Medical Association Doctor Finder

Dictionaries & Thesauri

Merriam Webster
Dictionary.com - choice of dictionary, thesaurus or encyclopedia
Wordsmyth dictionary thesaurus
Onelook dictionary search - definitions and translations
National Library of Medicine Medical Dictionary
French dictionaries
Ultimate Computer Acronyms Archive - Consult a database of computer-related acronyms.

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Citation, Grammar & Style Manuals

Cornell Legal Institute
Citation styles - MLA, APA, Chicago, etc, links compiled by Yahoo
American Heritage Book of English Usage
Forms of address for officials
Strunk's Elements of Style

Government Information

U.S. Government portal
U.S. State governments and legislatures
U.S. Municipal codes
France - administrative offices
French Legislation

Website Information

Wayback Machine - Archive of past websites.
Whois - Domain name registration search.
Finding old web pages - list of resources provided by Search Engine Showdown